mb/lenovo: Prepend EC event number with 0x to denote hex notation

Currently, the message below is printed, suggesting it’s decimal
notation:

    coreboot-4.12-1530-g7acbd5fc45 Sun Jul 19 07:47:58 UTC 2020 smm starting (log level: 7)...
    EC event 48
    GPI (mask 1000)

Prepend 0x, so it’s clear it’s hexadecimal notation.

    EC event 0x48

Use the command below change all places:

    git grep -l 'EC event %02x' | xargs sed -i 's/EC event %02x/EC event %#02x/'

Change-Id: I8d1e6434a0e550c5a19576f9f7fea05e7a812e49
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43585
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/mainboard/lenovo/t410/smihandler.c b/src/mainboard/lenovo/t410/smihandler.c
index ade22ff..08b5d2f 100644
--- a/src/mainboard/lenovo/t410/smihandler.c
+++ b/src/mainboard/lenovo/t410/smihandler.c
@@ -23,7 +23,7 @@
 		return;
 
 	event = ec_query();
-	printk(BIOS_DEBUG, "EC event %02x\n", event);
+	printk(BIOS_DEBUG, "EC event %#02x\n", event);
 
 	switch (event) {
 	case 0x18: